Description
Need to log in to your Sig Sauer account to be able to use the code.
The MCX platform has long been SIG SAUER’S breeding ground for developing the best rifle system in the world through extensive testing, continued innovation, and customer feedback. Now SIG SAUER introduces the SIG SAUER MCX-SPEAR LT 16-in Conversion Kit, allowing M4/AR15 owners to experience the SPEAR LT capabilities.
The SIG SAUER MCX-SPEAR LT Rifle represents the pinnacle of firearm innovation, delivering unrivaled performance, enhanced accuracy, and unmatched versatility. Whether for professional use, competitive shooting, or personal defense, this rifle offers an exceptional shooting experience you can rely on. Experience the evolution of excellence with the MCX-SPEAR LT.
Modernize your existing M4/AR15 lower assembly with this out-of-the-box, ready-to-go conversion kit. This kit contains all the necessary components for easy installation and range enjoyment of the SPEAR LT.
Features:
Adapts any M4/AR15 MIL spec lower assembly
Dual rod recoil assembly eliminates buffer system
M4 adapter and included telescoping coyote stock assembly
ROMEO4XT-PRO red dot sight with mount and flip-back lens covers
MLOK vertical grip.
Adjustable gas system for suppressor optimization
Quick change barrel design allows to easily and consistently swap calibers and barrel lengths
Gas piston design reduces part exposure to carbon fouling
Designed to go 20k rounds before any part replacements
SLX/SLH Next Gen suppressor designed QD flash hider for clutch-lok adaptability
Ambidextrous charging handle with gas deflector
Replaceable parts (cam path follower, feed ramp, forward assist/deflector, charging handle locking pins) allow for longer receiver life over standard AR designs.
Tapered bolt design functions more reliably and lasts longer than standard square lug m4 bolt designs.
Nitride-coated cold hammer forged barrel for optimal accuracy and barrel life
ROMEO4XT-PRO Features:
Illumination control moves to the top, providing easy access with either hand
A dedicated night vision override switch makes short work of drastic changes in lighting conditions and by combining MOTAC with a common AAA battery
Rated for 50,000 hours of runtime.
IPX8-rated for waterproof and fogproof performance and is tested to MIL-STD-810 to ensure reliable service.
Included items:
Complete 16" 5.56 NATO upper assembly includes our ROMEO4XT-PRO, MLOK vertical grip, telescoping stock, and removable 3-prong flash-hider ready to accept our SLH & SLX suppressor systems.
Specifications
SKU UAMCX-556N-16B-LT-TT-R4XT
Model SIG MCX-SPEAR LT
Barrel Extension MCX
Barrel Length 16 in [406.4 mm]
Barrel Rifling Type Hammer Forged
Bolt Carrier Group Included Yes
Caliber 5.56 mm (.223 Rem.)
Charging Handle Included Yes
Color Black / Flat Dark Earth (FDE)
Forward Assist Yes
Free Floated Handguard Yes
Handguard Length (in.) 13
Handguard Material Aluminum
Muzzle Device Clutch-Lok Tapered QD Flash Hider
Muzzle Thread Pitch 1/2-28
Operating System Short-Stroke-Piston
Receiver Finish Anodized
Twist Rate 1:7
Comments (25)
Got the code to work with a new account but the order cannot be processed lmao
Try now, the code seems to be working again. Remember, you need to have a Sig account and you need to log in first to get the code working.
Code says it isn't valid anymore for me. It was working earlier I just couldn't get through checkout.
I tried multiple cards about 15 times, but nothing worked. Then, I purchased through Sizzler using the buy now, pay later option. Got it shipped for 1480. Happy hunting
I’ve had 2 cards that won’t go through. I’ll try another
I was able to get one. First card tripped fraud and failed, had to use a different card.
I am getting a decline notification and my credit card company says the transaction is not showing on their end.
I had been contemplating at the previous price but when it dropped I went ahead. All added up its basically cheaper than a jakl upper or very close to the same price. Order says processing.
$1,392.69 with code as of this posting.
Deal still works ! great to get into the MCX-SPEAR LT line
Must be signed into Sig to redeem code.
The coupon code "AVANTUA-LXM3TK" is not valid.
For those having issues, you HAVE to have a Sig Account, but you can just create one. After you create one, add to your cart, and use code AVANTUA-LXM3TK. I followed these instructions and got the price down. My kit comes tomorrow or Friday. Pretty amazing deal considering it comes with a Romeo 04XTPRO, which is at it cheapest on gun.deals for $579.99. This means you can get a pretty decent piston upper w/ optics and everything to build out the lower except the lower itself, FCG, and grip. You could fairly easily build this whole thing out for $1800-1900.
I have an account and logged in. The price shows $2199.99. How do you get it for $1692.69?
This deal includes a Romeo 4XTPro which is worth $500+.
You need to log in to your Sig Sauer account (or register an account) to be able to use the code.



I had to create a new account to get it to work after my first account had an error.. I think if you get an error once it thinks your account has already used that code and won't work again. Just got it to work 5 min ago.